51.

1. arrived
2. migrated
3. traveled
4. moved

52.

1. excellent
2. genuine
3. false
4. rare

53.

1. originating
2. innovating
3. designing
4. imitating

54.

1. subscription
2. retention
3. circulation
4. accumulation

55.

1. respectful
2. respectable
3. respective
4. respecting

56.

1. rough
2. fragile
3. aged
4. preserved

57.

1. right
2. simply
3. only
4. late

58.

1. invented
2. discovered
3. detected
4. located

59.

1. lawful
2. financial
3. administrative
4. criminal

60.

1. fakes
2. realities
3. originals
4. duplicates

(Reference keys.)